When automatically forwarding the “To:
” email address doesn’t change, only the “Delivered-To:
” is changed.
The “To:
”, “CC:
”, “BCC:
” are the only email header values considered in Discourse.
I describe how to setup forwarding in a way that uses a custom domain here:
https://meta.discourse.org/t/set-up-reply-via-email-support/14003/48?u=deanmarktaylor
And here:
https://meta.discourse.org/t/set-up-reply-via-email-support/14003/50?u=deanmarktaylor